KGB predecessor, K.G.B. predecessor

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Possible Answers: OGPU.

Random information on the term “OGPU”:

There was a succession of Soviet secret police agencies over time. The first secret police after the Russian Revolution, created by Vladimir Lenin’s decree on December 20, 1917, was called “Cheka” (ЧК). Officers were referred to as “chekists”, a name that is still informally applied to people under the Federal Security Service of Russia, the KGB’s successor in Russia after the dissolution of the Soviet Union.
Taken from Wikipedia